#!/usr/bin/env python

# Copyright (C) 2017-2024 Vanessa Sochat.

# This Source Code Form is subject to the terms of the
# Mozilla Public License, v. 2.0. If a copy of the MPL was not distributed
# with this file, You can obtain one at http://mozilla.org/MPL/2.0/.

import argparse
import os
import sys


def get_parser():
    parser = argparse.ArgumentParser(
        description="Singularity Client",
        formatter_class=argparse.RawTextHelpFormatter,
        add_help=False,
    )

    # Global Options
    parser.add_argument(
        "--debug",
        "-d",
        dest="debug",
        help="use verbose logging to debug.",
        default=False,
        action="store_true",
    )

    parser.add_argument(
        "--quiet",
        "-q",
        dest="quiet",
        help="suppress all normal output",
        default=False,
        action="store_true",
    )

    parser.add_argument(
        "--version",
        dest="version",
        help="show singularity and spython version",
        default=False,
        action="store_true",
    )

    subparsers = parser.add_subparsers(
        help="description",
        title="actions",
        description="actions for Singularity",
        dest="command",
        metavar="general usage",
    )

    # Recipes

    recipe = subparsers.add_parser("recipe", help="Recipe conversion and parsing")

    recipe.add_argument(
        "--entrypoint",
        dest="entrypoint",
        help="define custom entry point and prevent discovery",
        default=None,
        type=str,
    )

    recipe.add_argument(
        "--json",
        dest="json",
        help="dump the (base) recipe content as json to the terminal",
        default=False,
        action="store_true",
    )

    recipe.add_argument(
        "--force",
        dest="force",
        help="if the output file exists, overwrite.",
        default=False,
        action="store_true",
    )

    recipe.add_argument(
        "files",
        nargs="*",
        help="the recipe input file and [optional] output file",
        type=str,
    )

    recipe.add_argument(
        "--parser",
        type=str,
        default="auto",
        dest="parser",
        choices=["auto", "docker", "singularity"],
        help="Is the input a Dockerfile or Singularity recipe?",
    )

    recipe.add_argument(
        "--writer",
        type=str,
        default="auto",
        dest="writer",
        choices=["auto", "docker", "singularity"],
        help="Should we write to Dockerfile or Singularity recipe?",
    )

    # General Commands

    subparsers.add_parser("shell", help="Interact with singularity python")
    subparsers.add_parser("test", help="""Container testing (TBD)""")

    return parser


def set_verbosity(args):
    """determine the message level in the environment to set based on args."""
    level = "INFO"

    if args.debug:
        level = "DEBUG"
    elif args.quiet:
        level = "QUIET"

    os.environ["MESSAGELEVEL"] = level
    os.putenv("MESSAGELEVEL", level)
    os.environ["SINGULARITY_MESSAGELEVEL"] = level
    os.putenv("SINGULARITY_MESSAGELEVEL", level)

    # Import logger to set
    from spython.logger import bot

    bot.debug("Logging level %s" % level)
    import spython

    bot.debug("Singularity Python Version: %s" % spython.__version__)


def version():
    """version prints the version, both for the user and help output"""
    import spython

    return spython.__version__


def main():
    parser = get_parser()

    def print_help(return_code=0):
        """print help, including the software version and active client
        and exit with return code.
        """
        v = version()
        print("\nSingularity Python [v%s]\n" % (v))
        parser.print_help()
        sys.exit(return_code)

    if len(sys.argv) == 1:
        print_help()
    try:
        # We capture all primary arguments, and take secondary to pass on
        args, options = parser.parse_known_args()
    except Exception:
        sys.exit(0)

    # The main function
    func = None

    # If the user wants the version
    if args.version:
        print(version())
        sys.exit(0)

    # if environment logging variable not set, make silent
    set_verbosity(args)

    # Does the user want help for a subcommand?
    if args.command == "recipe":
        from .recipe import main as func

    elif args.command == "shell":
        from .shell import main as func

    elif args.command == "test":
        from .test import main as func

    else:
        print_help()

    # Pass on to the correct parser
    if args.command is not None:
        func(args=args, options=options, parser=parser)


if __name__ == "__main__":
    main()